A267832 - OEIS

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A267832 as a simple table

n	a(n)
1	1
2	3
3	11
4	54
5	330
6	2430
7	20970
8	207900
9	2331000
10	29189160
11	404044200
12	6129723600
13	101181603600
14	1805933329200
15	34664949118800

[1,3,11,54,330,2430,20970,207900,2331000,29189160, 404044200,6129723600,101181603600,1805933329200, 34664949118800]